Method of stippling surfaces



Filed Feb. 24, 1921 a s I'RI HHUJLIMI/ Patented Mar. 27, 1923.

CHARLES e. Hmrso'n, or NEW YORK, N. Y.

METHOD OF STIPPLING SURFACES.

Application filed February 24, 1921. Serial N0. 447,414.

To all whom it may concern:

Be it known that 1, CHARLES G. HAMrsox, a citizen of the United States, and res1- dentof New York city, in the county of Kings and State of New York, have invented certain new and useful Improvements in Methods of Stippling Surfaces, of which" the following is a specification.

My invention relates to a stippling implement and constitutes an improvement in devices heretofore known as stippling brushes used to contact repeatedly with a coated surface to give the well known mottled or stippling effect. The brushes previously used have been made of.long stiff bristles set into a suitable back which makes up a heavy structure and which must necessarily be made of relatively small dimensions so as to be handled by the usual manual operation of stippling walls and other surfaces. The bristles of the brush have a tendency to bunch together and if the color on the surface under treatment should happen to be a little too thick it gets into the bristles, causing them to adhere and a re-' sulting irregularity and blotting effect in the appearance of the stippled surface. Another disadvantage of the brush structure is that it is almost sure to wear away unevenly. The edges wear down more rapidly than the central portion, resulting in a turning of the bristles sothat the sides of the individual bristles, rather than the ends come in contact with the surface under treatment, resulting in an impairment of the desired results.

In some refined operations, such for instance, as the stippling of paper and other fabrics it is necessary that the operator pos sess some considerable skill in obtaining a uniformly appearing effect over the entire surface treated and as unskilled labor cannot be used the work is expensive.

Among the objects of the invention is to provide a simple and inexpensive form of stippling tool which will-avoid these objectionable features, which even a novice can use to obtain a uniform appearing stippled surface and which can be made light andtherefore of large size to feature economy in cost of operation.

I obtained this invention broadly by providing a tool with a. resilient roughened work face, which avoids the separable point-s characterizing a brush structure, and, while permitting a slight freedom of movement between the points will at the same time act to hold the points from any material amount ofspreading and to cause the points engaging the surface under treatment to possess a certain fixidity of'relative position and a certain irregularity in the grouping of the points.

I attain this object in one physical embodiment of the invention by forming the work engaging surface of the instrument of a porous rubber sponge and by varying the effect produced on the treated surface by the selection of sponges of difierent porosity.

Various otherobjects and advantages of the invention will be in part obvious from an inspection of the accompanying drawings and in part will be more fully set forth in the following particular description of one form of mechanism embodying my invention, and the invention also consists in certain new and novel features of construction and combination of parts hereinafter set forth and claimed.

In the accompanying drawings Figure 1 is a perspective view of a hand implement illustrating a physical embodiment of the invention; and

Figure 2 is a transverse sectional view through the device shown in F igure l.

In the following description and. in the claims, parts will be identified by specific names for convenience of expression but they are intended *to'be as generic in their application to similar parts as the art will permit.

In the drawings there is illustrated an implement intended to illustrate an embodiment of the invention in its simplest form and therein shown to be a hand implement comprising a back or support 10 with a suitable handle 11 on one side and a relative-.

vly thick layer of porous rubber sponge 12 on the opposite side. The outlining edge of the back is inturned to form a retaining head 13 to hold the sponge in place. The sponge is also glued to the back. i

This sponge is' of usual well known light, porous construction, provided with pores or cavities 15 some of which, as indicated at 16, are opened through the work face 17 of the device.

The embodiment of the invention herein illustrated discloses an implement with a flat working face, but a certain form of stippled effect can be produced I with the stippling member in the form of a cylinder, free to rotate about its own axis and moved across the coated surface either by hand or by suitably positioning the implement in a maclliline designed to drive the brush mechanica y.

In operation the surface ,to be treated is gone over by bringing the work face repeatedly against the surface by patting or beating the surface sometimes with a straight movement to and from the surface and under other conditions with a side movement. In the use of this instrument no especial care need be taken that the work face approaches the surface in parallelism as the rubber sponge has enough give to make contact over its entire face.

These pores which open through the work surface and perhaps even the pores which are below the work surface seem to exert a slight suction effect upon the coating of the surface when the implement is withdrawn therefrom giving rise to an appearance on the surface treated somewhat difierent from the appearance formed by the tapping of such a coated coating with a brush. It is apparent that as the work surface of the rubber wears away, a new surface is presented having the same general characteristics of the preceding surface so that the implement can be used practically as long as there is sufficient sponge material remaining. to give a cushion efi'ect to the work surface.

The device disclosed features economy both in construction and in the labor of using the same. A rubber sponge is much cheaper than the expensive bristles which have heretofore been regarded as necessary for such work and the porous construction permits the use of a large brush in manual operation. With a larger brush the operator can more rapidly cover a given surface than with the heavier and necessarily smaller brushes heretofore in use. Featuring the elements of lightness in Weight it may be assumed that the backing or support in the illustrated showing is of some light metal, such as aluminum. It is thus possible by this disclosure to provide a manually actuated brush of say fifteen inches along the sides While such a large sized brush made of bristles with its necessarily heavy back to hold the bristles in place would be unwieldy and tiresome to operate.

While I have shown and described and have pointed out in the annexed claims, certain novel features of my invention, it will be understood that various omissions, substitutions and changes in the form and details of the device illustrated and in its operation. may be made by those skilled in the art without departing from the spirit of the invention.

Having thus described my invention, I

claim:

1. In the art of stippling a wet coated surface, the method which consists in subjecting the wet coating, first to the pressing action of a compressible member having a rough flexible surface with air pockets opening therethrough in irregularv relation and then withdrawing the member to' cause the irregularly disposed air pockets to exert a slight suction effect on the coating.

2. In the art of stippling a wet coatedsurface, the method which consists in subjecting the wet coating to thesuction action of a porous spongelrubber surface, when lightly applied and then withdrawn from I 

